1990 All Japan Sports Prototype Car Endurance Championship

The 1990 All Japan Sports Prototype Car Endurance Championship was the eighth season of the All Japan Sports Prototype Championship. The 1990 champion was the #24 Nissan Motorsports Nissan R91CP driven by Masahiro Hasemi and Anders Olofsson.

Schedule
All races were held in Japan.

Season results
Overall winner in bold. Season results as follows: